Sidney Lau Латинизация Кантонский:

In the Sidney Lau Латинизация Кантонский, Кантонский words are notionally made up of an optional initial sound, a final sound, and a tone. The Sidney Lau System uses numeric and symbolic superscripts to represent tones.

Sidney Lau’s Romanization System is also used by Martha Lam and Stanley Po in their Кантонский course “Functional Cantonese”. The only difference is that diacritics are used instead of numerical superscripts. See the section on Кантонский Tones for more details.